RDB BullpupDownward-ejecting bullpup. Features a rotary bolt with a spring loaded ejector and an extractor facing down. Spent case is pulled backwards along the top of the magazine and then ejected through a vertical chute. Hammer is U-shaped and runs outside the chute and above the magazine. Bolt travel is longer than traditional designs but well within the ergonomic constraints of a rifle. Picatinny rail allows the use of any aftermarket optical, electronic or flip-up sighting system. Backbone of the rifle is formed by the barrel and its extension which runs rearward to serve as bolt group guide and structural support for external housing which is made of plastic. Uses STANAG (M16 / AR15 compatible) magazines and magazine release lever is centrally located in front of the magazine housing. To release the magazine, one has to push this lever backwards and this can be done by either non-firing hand or by the back of the firing hand depending on situation and user preferences.

Through an ingenious and simple arrangement we have solved the main disadvantage of Bullpup rifles; case ejection. Traditional side ejection is not ambidextrous and forward eject, like in the FN 2000 or the Kel-Tec RFB, is quite complex.

The RDB (Rifle Downward-eject Bullpup) features a rotary bolt with a spring loaded ejector and an extractor facing down. The spent case is pulled backwards along the top of the magazine and then ejected through a vertical chute. The hammer is U-shaped and runs outside the chute and above the magazine. Obviously, the bolt travel is longer than traditional designs but well within the ergonomic constraints of a rifle. Other advantages are gravity assisted ejection, higher bolt energy at feeding and a slower full auto rate (when applicable).

The RDB is built around a common steel skeleton formed by the receiver and barrel sub-assemblies. Bolt, bolt carrier, firing mechanism, ejector chute and bolt stop are identical for all variations. The short stroke gas operated piston is fully adjustable for different ammunitions and muzzle attachments